Skateboard back pack



FIG. 1 is a front elevational view of my new design for a skateboard back pack shown in a flaccid condition;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view of the skateboard back pack filled out, as it would appear in a condition of use;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a skateboard back pack, as shown and described. 